CN105191166A - Mitigation of interference from a mobile relay node to heterogeneous networks - Google Patents

Mitigation of interference from a mobile relay node to heterogeneous networks Download PDF

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Publication number
CN105191166A
CN105191166A CN201380063942.8A CN201380063942A CN105191166A CN 105191166 A CN105191166 A CN 105191166A CN 201380063942 A CN201380063942 A CN 201380063942A CN 105191166 A CN105191166 A CN 105191166A
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mobile relay
relay node
base station
wireless backhaul
backhaul link
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CN201380063942.8A
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CN105191166B (en
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G·D·布罗
K·迪谋
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/46—TPC being performed in particular situations in multi hop networks, e.g. wireless relay networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures

Abstract

Devices, systems and methods for mitigating the interference introduced by mobile relay nodes in a heterogeneous network are described. The techniques described apply fractional frequency reuse and power controlled beamforming to mitigate such interference.

Description

Alleviating of interference from mobile relay node to heterogeneous network
Technical field
Relate generally to of the present invention reduces the interference in wireless communication system, and relates more particularly in heterogeneous wireless network, reduce the interference from mobile relay node.
Background technology
Need new mode to meet this demand to the demand of the more continual increase of high data rate in cellular networks.Developed the different mechanisms for increasing cellular network data speed, such as increases the density of macro base station (BS), increase the cooperation between macro base station and in macro base station grid, require the base station that the deployed in areas of high data rate is less or via node (RN).The option disposing less base station or via node in macro base station grid is commonly called isomery and disposes (formation heterogeneous network), and less base station layer is called as microbedding or slight layer, and this depends on the characteristic of less base station.
Although each of above-mentioned selection can cause the data rate increasing cellular network, select relevant economy typically to show creating heterogeneous network to these can be the practising way that cost effectiveness is the highest.Further, the time frame executive mode of operator request also seems to be more suitable for heterogeneous network scheme.As the example that isomery is disposed, and with reference to figure 1a and 1b, isomorphism cellular network 100 can be represented as the set of community 102,104,106,108,110, and they each represents the radio communication cover territory of macro base station.Fig. 1 b illustrates exemplary heterogeneous network, its small area 102,104,106,108,110 still provides radio communication to cover by their respective macro base stations, but the mode of wherein disposing with isomery each provides micro-/femto base station 112,114,116 to strengthen covering in the cell area of macro base station 102,104,110.
Creating one of target of heterogeneous network is allow micro-/femto base station to share user as much as possible from macro-layer, allows the higher data rate in macro-layer and micro-/slight layer.For this reason, the different technologies of the capacity for increasing micro-/femto base station is proposed.First, capacity can be increased by using specific community, community to select skew to expand the scope of micro-/femto base station.Community selects skew to be for determining that subscriber equipment should be connected to a factor of heterogeneous network via micro-/femto base station or macro base station.Secondly, can by increasing the transmitting power of micro-/femto base station and suitably arrange up link (UL) power control target (P for the user being connected to micro-/femto base station simultaneously 0) and increase capacity.
In some cases, the high backhaul cost be such as associated with the micro-/femto base station of increase, via node (RN) can provide feasible scheme to provide scope and/or the capacity of increase to be with the use of interior (wireless) backhaul based on it.Via node can provide femto base station type to cover in indoor or outdoor, and reduces cost from ground line backhaul to all femto base stations and the effort of disposing.In further scene, deposit user on a mobile platform, be about to the commuter/passenger train of being benefited from mobile relay node.The realization of mobile relay node comprises this locality access of the user on from mobile relay node to mobile platform, and from mobile relay node to return bandwidth in the band of fixed service macro base station or eNB.
Problem relevant with adopting the heterogeneous network of via node serve or back haul link (Un) between donor base station and via node understands the extra interference that produce in grand network on general aspiration level.The interference increased can reduce the capacity of grand network, thus destroys the wish creating heterogeneous network.Such as, as shown in Figure 2 a, in the backhaul Un ul transmissions 214 of the via node 216 of the Un ul transmissions 208 of given macro base station 204 meeting adjacent macro base station 202, interference 212 is caused from via node 210.In addition, the Un ul transmissions 208 from the via node 210 in a macro base station community 218 can disturb terminal or subscriber equipment (UE) 222 in 220 adjacent macro base station communities 226 to go to the ul transmissions between their service relay node 224.
A corresponding problem also can occur, and down link (DL) transmission wherein on Uu link can cause interference in the down link Un link of neighbor cell via node.Should be noted that, these scenes probably occur, because the typical deployed of via node is exactly those deployment of cell edge via node being arranged in adjacent alms giver's macro base station, thus makes the adjacent macro base station of the mutual close proximity of layout support of via node.Consider mobile relay node, when the service eNB that mobile relay node moves to distance alms giver macrocell is nearer, potential interference scene can aggravation further.In the scene of this mobile relay node, the subscriber equipment be associated with alms giver's macrocell close to alms giver's macrocell edge can be moved the backhaul Un link severe jamming that via node goes to alms giver eNB.In addition, if mobile relay node is too close to alms giver eNB, then it can hide the front end of alms giver eNB completely and cause all users served by this alms giver eNB to break.
Consider LTE network, the existing mode alleviating this types of interference is included in alms giver's macrocell the time division multiplexing of carrying out Un and Uu transmission and disturbs Uu to reduce potential Un.Such interference mitigation mode has two subject matters, although one is the interference that time division multiplexing reduces in given alms giver's macrocell, but it can not ensure the interference reduced between the via node of adjacent grand donor cell, the mobility of via node also can cause the deterioration of this problem, even if two is that via node can for Un link user directional antenna, the remarkable interference of the Uu link to the via node in adjacent grand donor cell still can be caused for the secondary lobe of the via node antenna of Un link and/or episternites.When mobile relay node is very near alms giver eNB or when serving long distance wireless dateline (RRH) of grand donor cell, a rear problem is the most obvious.
It should be noted that the above-mentioned situation in LTE network can occur when mobile relay node is deployed in the edge close to adjacent grand donor cell, as mentioned above, this is the most probable position of mobile relay node.Although in theory, when the via node that time domain limits adjacent grand donor cell can carry out transmitting on their Un and Uu link may be enough to alleviate interference, but this can require to carry out strict time synchronized between the mobile relay node in adjacent grand donor cell and adjacent alms giver's macrocell, and generally speaking, cellular network may not be time synchronized.
Therefore, be very important for reducing the effort of the method for the interference deployed in the asynchronous cellular network of mobile relay node for service provider, and be also important for the client of this cellular network of access indirectly.
Summary of the invention
Embodiment described here provides alleviating for the wireless backhaul link in the heterogeneous radio communication network deploying mobile relay node and the interference between radio access links (and between multiple wireless backhaul link).These embodiments alleviate the interference within donor cell, and the interference between donor cell in heterogeneous network, and it is clear and definite synchronous not require between neighbor cell.
According to exemplary embodiment, describe a kind of method, it stores in memory and runs on a processor, for alleviating the interference be associated with the transmission in the radio access links of mobile relay node and wireless backhaul link.Fractional frequency reuse is applied between the radio access links be associated with described mobile relay node and wireless backhaul link.Applying the wireless backhaul link be associated with mobile relay node with power-controlled is the wave beam forming (powercontrolledtargetedbeamforming) of target.
According to another embodiment, a kind ofly can be used for the node alleviating the interference be associated with the transmission on radio access links and wireless backhaul link in a radio communications system, comprise processor and transceiver, this processor and transceiver are configured to applying portion frequency reuse between the radio access links be associated with mobile relay node and wireless backhaul link, and wherein this processor and transceiver are configured to apply the wireless backhaul link be associated with mobile relay node with power-controlled is further the wave beam forming of target.
According to another embodiment, a kind of mobile wireless via node, comprise the housing being configured to be arranged on moveable platform, be configured to (a) in wireless backhaul link, transmit and receive at least one transceiver transmitting and receiving the wireless signal to and from least one subscriber equipment to and from the wireless signal of alms giver's macro base station and (b) on radio access links; And wherein this at least one transceiver is configured to the transmitting and receiving applying portion frequency reuse to the wireless signal be associated with this wireless backhaul link further.
Accompanying drawing explanation
Exemplary embodiment explained by accompanying drawing, wherein:
Fig. 1 a illustrates homogeneous network, and Fig. 1 b illustrates heterogeneous network;
Fig. 2 a illustrates the heterogeneous network having the typical case that is associated with mobile relay node and disturb;
Fig. 2 b illustrates the various aspects be associated with via node;
According to exemplary embodiment, Fig. 3 a illustrates that frequency partition arrives the mapping for the mobile relay node spatial distribution of Un to Uu fractional frequency reuse (FFR) in community;
According to exemplary embodiment, Fig. 3 b illustrates that frequency domain FFR divides;
According to exemplary embodiment, Fig. 4 a illustrates that frequency partition is to the mapping had across the mobile relay node spatial distribution of the FFR of power-controlled Un wave beam in alms giver's macrocell;
Fig. 4 b illustrates the frequency domain FFR bandwidth partition across Un wave beam in alms giver's macrocell according to exemplary embodiment;
According to exemplary embodiment, Fig. 5 a illustrates that frequency partition arrives the mapping of mobile relay node spatial distribution, this mobile relay node spatial distribution has the FFR across power-controlled Un wave beam in the alms giver's macrocell possessing dedicated channel status information reference signal;
Fig. 5 b illustrates the frequency domain FFR bandwidth partition across Un wave beam in alms giver's macrocell according to exemplary embodiment;
According to exemplary embodiment, Fig. 6 illustrates that frequency partition arrives the mapping of mobile relay node spatial distribution, this mobile relay node spatial distribution has the FFR across power-controlled Un wave beam in alms giver's macrocell, and wherein this mobile relay node is attached to the nearest picocell/long distance wireless dateline of alms giver's macrocell;
Fig. 7 be transmit according to exemplary embodiment Un and Uu alleviated in heterogeneous network between one or more mobile relay node and one or more stationary nodes between the flow chart of method of interference; And
Fig. 8 illustrates the exemplary base of the interference mitigation system for realizing mobile relay node according to exemplary embodiment.
Embodiment
Following reference accompanying drawing is described in detail to exemplary embodiment.Identical or the like of same reference numerals instruction in different accompanying drawing.Further, follow-up detailed description does not limit the present invention.On the contrary, scope of the present invention is defined by appended claim.
In this specification, " embodiment ", mentioning of " embodiment " are meaned that associating with embodiment the special characteristic, structure or the characteristic that describe is included at least one embodiment of the present invention.Thus, same embodiment might not be referred in the appearance of each position phrase " in one embodiment " of this specification or " in an embodiment ".In addition, this special characteristic, structure or characteristic can combine in one or more embodiments in any suitable manner.
Such as, in order to solve the problem mentioned in background technology part, general exemplary embodiment comprises and combinationally uses fractional frequency reuse (FFR) and be that the wave beam forming of target is to alleviate the interference between the transmission from mobile relay node and the transmission from bottom heterogeneous network with power-controlled.Before the concrete exemplary embodiment of discussion, the scene of 2b provides the brief discussion of relaying technique by reference to the accompanying drawings.
As shown in the figure, the feature of repeater 250 is that (a) interface can launch radiocommunication signals to subscriber equipment 252 (such as mobile radio station) aloft, and the radiocommunication signals received from subscriber equipment 252, and (b) can launch radiocommunication signals to base station 254 (sometimes referred to as " alms giver " base station), and receive the radiocommunication signals from base station 254.The back haul link 256 of base station 254 is typically implemented as the physical link being connected to core net node 258, different from base station 254, and the back haul link 260 (comprising up link 262 and down link 264) of repeater 250 is wireless backhaul link.In LTE standard term, the wireless backhaul link 260 of repeater is called as " Un " link, and the wireless radio access links 266 of repeater is called as " Uu " link.
Dissimilar relaying technique can be used to realize repeater 250.Such as, the first repeater (sometimes referred to as " transponder " or layer 1 relaying) is operating as the radio signal of amplification reception and does not carry out any other process to signal.Another kind of repeater (sometimes referred to as layer 2 relay) be operating as amplify and before retransmitting demodulate/decode coded/modulated radio signal to reduce the amplification to the noise received.The third repeater (sometimes referred to as layer 3 relaying) even carries out signal transacting more more than layer 2 relay to the radio signal received, such as encryption and user data series connection/decompose/restructuring, and the benefit provided is the repeater air interface produced is very similar to the air interface be associated with exemplary base station, and and has the consistency of higher degree between standardized way.In order to the object of this discussion, term " relaying " is used for comprising these (and other) relaying techniques by generality.
For the embodiment next described, special concern be mobile relay node.As used in this, phrase " mobile relay " or " mobile relay node " to refer to be arranged on loose impediment or platform and can be operating as the repeater of the wireless radio signal when changing position or place between relay base station and mobile radio station.A non-limiting example of this loose impediment or platform is train, but other objects or platform also will be apparent to those skilled in the art.In addition, it should be noted that phrase " mobile relay " and " mobile relay node " as used herein must not mean that this via node (or loose impediment accompanying by this via node or platform) is always moving.Mobile relay described here or mobile relay node can be static sometimes, such as, when train arrives at a station.
Under this linguistic context, to discuss three kinds of concrete exemplary embodiments in detail now, and usually its feature can be: 1) Un to UuFFR in mobile relay node community, to it, this FFR implements in the alms giver's macrocell between Un and Uu transmission, be combined in the power-controlled wave beam forming on the Un link between mobile relay node and eNB, wherein this FFR divides and can cross over Un and Uu transmission, and more generally, this FFR divides the independent Un wave beam that can further include service eNB; 2) mobile relay node minizone Un to UuFFR, for it, Un and the Uu link between this FFR is implemented as across adjacent alms giver's macrocell, in conjunction with the power-controlled wave beam forming of Un link; And (3) mobile relay node Un link, it is assigned to the nearest long distance wireless dateline of alms giver's macrocell at this mobile relay node place.But the discussion that those skilled in the art can understand these specific embodiments is just indicative merely for the present invention, instead of restrictive.
First see accompanying drawing 3a and 3b, show and use Un to UuFFR in community and in conjunction with the exemplary embodiment of power-controlled wave beam forming 300, and, among other things, also show the area of space of frequency field to alms giver's macrocell 302,304,306 and the mapping of mobile relay node 308-324.Fig. 3 a is for illustration of exemplary beams figuration, and Fig. 3 b illustrates the exemplary FFR that may be implemented in this embodiment.From Fig. 3 a, mobile relay node Un link to alms giver eNB326,328, the wave beam forming 332,334,336 of 330 alleviates in alms giver's macrocell 302,304,306 between Un and Uu transmission interference.Should be noted that, in the exemplary embodiment, FFR implements, in each alms giver's macrocell between Un and Uu transmission, the Un link between this external mobile relay node and eNB326,328,330 also to carry out power-controlled directional antenna beam figuration 332,334,336.It should be noted that in the exemplary embodiment further, although in this description carried out for up link, identical mode can be applied to down link equally.
With reference now to Fig. 3 b, show and combine for the exemplary division in FFR mechanism with the wave beam forming of Fig. 3 a.Wherein, for given bandwidth 350, special frequency resource block (RB) 352,354 is assigned to the Un link between alms giver eNB and mobile relay node, and the dedicated frequency of dispersion is assigned in via node overlay area.It should be noted that in the exemplary embodiment, alms giver's macrocell can be crossed over whole available band 356 and assign frequency resource block.It should be noted that in the exemplary embodiment further, although above-mentioned explanation is for up link, identical mode can be applied to down link equally.
The exemplary embodiment of Fig. 3 a and 3b allows the flexibility on Resourse Distribute in time dimension in alms giver's macrocell, and does not require any fixing Un to Uu timing boundary and/or synchronously alleviate Un to Uu interference.Correspondingly, Un and Uu transmission can be asynchronous in time domain, and both in given mobile relay node and between the different mobile relay nodes being connected to the grand eNB of same alms giver, and Un to Uu interference can be alleviated.
Along with mobile relay node is close to alms giver's macrocell, Un link can carry out dynamic power control to minimize Un transmitting power based on multiple tolerance available in LTE standard, the Reference Signal Received Quality (RSRQ) that the Reference Signal Received Power (RSRP) of such as, alms giver's macrocell at mobile relay node place or channel condition information (CSI) reference signal (RS) are measured.Further in the exemplary embodiment, power control settings can be devoted to the path loss or the part path loss that compensate mobile relay node Un link.
In the another aspect of exemplary embodiment, the power control settings of mobile relay node Un link can be optimized for the interference power minimized adjacent alms giver's macrocell.It should be noted that this optimization can based on some factors in the exemplary embodiment, such as but not limited to the maximization of signal and leakage and noise ratio (SLNR).Consider the uplink side of exemplary embodiment, physical uplink link shared channels (PUSCH) or physical uplink control channel (PUCCH) data can be used to power controlling calculation in base station.Alternately, or extraly, if mobile relay node is not at transmitting data, then detection reference signal (SRS) can be used to determine power control settings.
In the another aspect of exemplary embodiment, unique channel state information reference signals (CSI-RS) can be assigned, to allow the multiple mobile relay nodes in alms giver's macrocell eNB differentiation alms giver macrocell to each of the multiple mobile relay nodes in alms giver's macrocell.Exemplary embodiment further in, A3 and A4 types of events message can be adopted to trigger the selection of FFR wave beam forming Un link.Should be noted that in the exemplary embodiment, above-mentioned technology can use in conjunction with via node subframe multiplexing mapping, as 3GPP technical specification 36.216, described in " the E-UTRA physical layer (E-UTRAPhysicalLayerforRelayingOperation) for operation of relays " version 10.3, incorporated herein by reference.
With reference now to Fig. 4 a, another exemplary embodiment 400 depicts the further strengthening of the exemplary embodiment to Fig. 3 a, the alms giver's macrocell eNB402 in alms giver's macrocell 426,428,430 coverage, 404, each Un wave beam between 406 from mobile relay node 408-424 is assigned different frequency partition 454,456,458.Continue this exemplary embodiment is discussed, the power-controlled wave beam of dispersion can be identified by the appointment of unique channel state information reference signals to each mobile relay node 408-424 the appointment of each mobile relay node 408-424Un link.Should be noted that in the exemplary embodiment, be implemented between Un and Uu transmission in each alms giver's macrocell 426,428,430 in conjunction with the FFR of power-controlled wave beam forming and each Un link individual, namely frequency field is to the mapping of the spatial dimension of alms giver's macrocell 426,428,430 and mobile relay node 408-424.
With reference now to Fig. 4 b, exemplary embodiment describes the FFR frequency partition 450 that the wave beam forming that can describe with above reference diagram 4a is combined.Wherein, the dedicated frequency that is made up of one or more Resource Block (RB) divides 452,454,456,458 and is assigned to alms giver's macrocell eNB402, Un link between 404,406 and mobile relay node 408-424, and the dedicated frequency of dispersion is assigned in mobile relay node coverage.It should be noted that alms giver's macrocell can be crossed over whole available band 460 and assign Resource Block in the exemplary embodiment.Although it should be noted that foregoing description is for up link in the exemplary embodiment further, same way can be used for down link equally.
In the another aspect of exemplary embodiment, sacrifice the flexibility of the Resourse Distribute in frequency dimension in alms giver's macrocell 426,428,430, with the further interference mitigation between providing the Un link in alms giver's macrocell 426,428,430.Should be noted that in the exemplary embodiment, such as inner at same alms giver's macrocell 426,428,430, from different mobile relay node 408-424 to alms giver's macrocell eNB402, during 404,406 time intervals of launching simultaneously, space is separated and is not enough to guarantee to alleviate interference, it is useful for doing like this, namely when two mobile relay node 408-424 in same alms giver's macrocell 426,428,430 make they to alms giver's macrocell eNB402,404, the Un link of 406 spatially overlapping time.
With reference now to Fig. 5 a, when Un and Uu transmission asynchronous and closely time, based on the relative position of the alms giver's macrocell edge 526 place mobile relay node 508-524 between different alms giver's macrocell 502,504,506, exemplary embodiment 500 alleviate Un to Un and Un to Uu transmission between interference and alms giver's macrocell 502,504,506 between interference.Continue to inquire into this exemplary embodiment, three different frequency regions are mapped to alms giver macrocell 502 different from three, 504, the different spaces scope of the 506 wireless backhaul up links be combined, and the 4th different frequency field is used in the relevant area of space of the wireless access links relevant to the mobile relay node 508-524 in all three alms giver's macrocells, as use in Fig. 5 a oval in ul transmissions energy range between each mobile relay node of different shadow representation and their respective alms giver's macrocells, and circle represents the ul transmissions scope between each mobile relay node and mobile radio station.Fig. 5 b illustrates the above-mentioned FFR frequency partition 550 of Fig. 5 a in another way, namely the dedicated frequency of Resource Block divides the Un link that 560,562,564 are assigned to Un link between alms giver's macrocell eNB528,530,532 and the current mobile relay node 508-524 relative to alms giver's macrocell location, and the dedicated frequency separated divides the coverage that 558 are assigned to mobile relay node 508-524.It is understood that use three alms giver's macrocells to be exemplary completely in this embodiment, and more or less community can be used in a similar manner in given system implementation plan.
Thus, according to this exemplary embodiment, the Un link in alms giver's macrocell obtains orthogonality by the use of power-controlled wave beam forming, and Un link between alms giver's macrocell based on the separately division 560,562,564 of FFR scheme appointment and isolate.It should be noted that each mobile relay node Un link beam can be assigned the unique channel state information reference signals controlling object for power in the exemplary embodiment.Should be noted that further in the exemplary embodiment, the appointment of the channel state information reference signals resource between adjacent alms giver's macrocell eNB528,530,532 can carry out coordinating guaranteeing from very close to and the mobile relay node belonging to different alms giver's macrocell 502,504,506 has unique channel state information reference signals resource, to identify this mobile relay node 508-524Un wave beam.It should be noted that as described by previous embodiments in the exemplary embodiment, can adopt to the distribution of the Resource Block of the subscriber equipment of any one service by alms giver's macrocell 502,504,506 Resource Block needed arbitrarily in frequency band.
Next in the exemplary embodiment, inner in mobile relay node overlay area, if Un and the Uu transmission of given mobile relay node is orthogonal in time, then Uu transmission can be configured to use common Uu frequency partition and alms giver's macrocell Un frequency partition.It should be noted that then Un and Uu transmission can occur, even if the realization of duplexer is challenging and expensive in mobile relay node simultaneously if Un and the Uu transmission of given mobile relay node keeps their given frequency partition in the exemplary embodiment.But in the exemplary embodiment, due to the availability of frequency band in given mobile relay node, while Un with Uu communicates, transmitting and receiving are possible, and without any need for expensive and powerful duplexer.It should be noted that in the exemplary embodiment and temporary guard band can be used to be separated Un transmission and Uu transmission.Although it should be noted that foregoing description is for up link in the exemplary embodiment further, same way can be used for down link equally.
In the another aspect of exemplary embodiment, frequency partition border can be fixing, but might not equal the quantity of Resource Block.In exemplary embodiment is further, frequency partition border can be Dynamic Selection based on the expectation relative scale business to given division.It should be noted that relative scale business is defined as dividing the active volume of business load divided by communication link of interior generation in the exemplary embodiment.
With reference now to Fig. 6, on the basis of previously described exemplary embodiment, for by alms giver's macrocell 602,604,606 and the heterogeneous network that forms such as but not limited to the less community of picocell/long distance wireless dateline 608 overlay node, exemplary embodiment is expanded.Should be noted that in the exemplary embodiment, the space topological of this heterogeneous network design can be used to the picocell/long distance wireless dateline 608 by mobile relay node 610Un link being linked to nearest alms giver's macrocell eNB612 or heterogeneous network, minimizes the interference produced by mobile relay node 610Un back haul link.
In the another aspect of exemplary embodiment, based on the generation of one or more trigger event, the combination in any of the feature described in the above-described embodiments can optionally or dynamically be implemented.Under this linguistic context, trigger event can one or more based on following event, and such as Un power level, SINR, SLNR or other relevant to the Un link of subscriber equipment are measured and reached preassigned.As specific non-limiting schematic example, such as, Trigger Logic may be embodied as the following various aspects starting the FFR relevant to mobile relay node and wave beam forming:
1) if mobile relay node Un power level is greater than the first predetermined threshold, then fractional rating is adopted to control;
2) otherwise, if if mobile relay node Un power level is greater than the second predetermined threshold or grand UuSINR is less than the 3rd predetermined threshold, then adopt UnFFR in dedicated beams figuration and/or community;
3) otherwise, if the SINR of mobile relay node Un link is less than the 4th predetermined threshold, then adopt FFR in community; And
4) if Uu's or the subscriber equipment relevant to alms giver's macrocell SLNR is greater than the 5th predetermined threshold, then the minizone FFR being used for mobile relay node Un link is adopted.Should be noted that in the exemplary embodiment, above-mentioned feature can use the required arbitrarily combination of hardware and/or software to realize, such as there is the software of engine module and command component, and the division between the components of various ability can use the mode being suitable for arbitrarily implementation to divide.
With reference now to Fig. 7, flow chart illustrates and to transmit to the Un between the mobile relay node of one or more motion and one or more stationary nodes and Uu transmits the illustrative methods 700 of relevant interference for alleviating in heterogeneous network.Wherein, in step 702, access applying portion frequency reuse between (as Uu) link at the backhaul be associated with mobile relay node (as Un) link and radio.Those skilled in the art can understand, based on the previous discussion to exemplary embodiment, the level of interference changes along with mobile relay node traversal cell coverage area, and when mobile relay node is such as close to cell edge and/or near other mobile relay nodes be associated with adjacent alms giver's macrocell, this interference can be in its maximum.Continue to inquire into the exemplary method embodiment of Fig. 7, in step 704, applying to the wireless backhaul link be associated with mobile relay node with power-controlled is the beam-forming system of target.
According to the previous discussion to each exemplary embodiment, it is understood that these and other embodiment has impact when realizing to the various nodes in radio communications system.Such as, above-mentioned various FFR scheme may need to realize on grand donor base station (as eNB) and mobile relay node.Above-mentioned wave beam forming can realize in down link and up link one of (or) at Hong Shizhujizhanchu, and also can realize on uplink at mobile relay node place.
Correspondingly, Fig. 8 illustrates the example of base station 800, and the various aspects of above-described embodiment can be implemented in wherein, although an example of the suitable node that base station is these embodiments can be realized.This exemplary base 800 comprises the radio circuit 810 being operably connected to and being arranged on one or more antennas (or aerial array) 815 in housing 835 and treatment circuit 820 and memory 830.In some variants, it is inner that radio circuit 810 is positioned in housing 835, and in other variants, radio circuit 810 is outside at housing 835.Be provided with network interface 840 to communicate with other network node (not shown) to make base station 800, comprise other base stations.Treatment circuit 820 is configured to such as transmit and receive the radio signal to and from UE, via node and mobile relay node via radio circuit 810, and can comprise one or more processor.As mentioned above, such as, with reference to figure 3-7, base station 800 can be configured to realize the FFR relevant to mobile relay node and/or power-controlled wave beam forming.Mobile relay node can be drawn, except network interface 840 can be embodied as transceiver to support the wireless backhaul link of mobile relay node with the similar fashion being similar to base station 800 in Fig. 8.
Base station 800 can comprise various computer-readable medium, and it stores and can be used for configuration process circuit 820 to realize the program command of above-mentioned functions.Computer-readable medium can be can be processed circuit 820 access any usable medium.Computer-readable medium can comprise such as but not limited to computer-readable storage medium and communication media.Computer-readable storage medium comprises the volatibility and non-volatile and removable and non-removable media that realize with any means or technology, for storing information, and such as computer-readable instruction, data structure, program module or other data.Computer-readable storage medium includes but not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CDROM, digital versatile disc (DVD) or other disk storages, cassette tape, tape, magnetic disc store or other magnetic storage apparatus, or can be used for storing information needed and other media any of circuit 820 access that can be processed.Communication media can include computer-readable instruction, data structure, program module can comprise any adequate information Transfer Medium.
Above-mentioned exemplary embodiment the innovation all in originally mean explanatory instead of restrictive.Thus the innovation can have from being contained in a lot of changes derived by those skilled in the art this explanation in specific implementation.All such changes and modifications are all considered within the innovation scope and spirit as determined in accompanying claims.It is key or basic that the element used in the specification of the application, action or instruction should not be considered to the present invention, unless clearly stated this has been.Further, article " " originally means and comprises one or more project as used herein.
Claims (amendment according to treaty the 19th article)
1. store in memory and the method performed on a processor, for alleviating the interference relevant to the transmission in the radio access links of mobile relay node and wireless backhaul link, described method comprises:
(702) fractional frequency reuse is applied between the radio access links relevant to described mobile relay node and wireless backhaul link; And
The wave beam forming that (704) are target with power-controlled is applied to the wireless backhaul link relevant to described mobile relay node.
2. method as claimed in claim 1, wherein said fractional frequency reuse is used in be had in alms giver's macrocell that be associated, fixing base station.
3. method as claimed in claim 2, wherein said is that the wave beam forming of target is used in the described wireless backhaul link between that described mobile relay node is associated with this, fixing base station with power-controlled.
4. method as claimed in claim 3, wherein the step of applying portion frequency reuse comprises further:
First group of special frequency resource block is assigned to the described wireless backhaul link between described mobile relay node and described base station; And
Described radio access links to described mobile relay node assigns second group of special frequency resource block.
5. method as claimed in claim 4, wherein said first group of special frequency resource block and described second group of special frequency resource block can be assigned across whole available band.
6. method as claimed in claim 1, wherein said wireless backhaul link and described radio access links comprise up link and both downlink.
7. method as claimed in claim 3, comprises further:
Along with mobile relay node changes the geographical position relative to described that be associated, fixing base station, regulate the power relevant to wireless backhaul link.
8. method as claimed in claim 7, wherein said adjustment based on following at least one carry out:
A () measures at the Reference Signal Received Power RSRP of described mobile relay node place channel condition information CSI reference signal RS;
B () measures at the Reference Signal Received Quality RSRQ of described mobile relay node place channel condition information CSI reference signal RS;
C () maximum signal and leakage and noise ratio SLNR measure;
(d) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink link shared channels PUSCH;
(e) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink control channel PUCCH; And
(f) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to detection reference signal SRS.
9. method as claimed in claim 3, comprises further:
To each mobile relay node assign unique channel state information CSI reference signal RS with that be associated described in allowing, fixing base station the relevant multiple mobile relay nodes of this alms giver's macrocell each between distinguish.
10. method as claimed in claim 9, wherein said application is that the step of the wave beam forming of target comprises further with power-controlled:
For each of the described wireless backhaul link between that be associated at described mobile relay node and this, fixing base station distributes different frequency partition.
11. methods as claimed in claim 1, wherein said fractional frequency reuse carries out between alms giver's macrocell, and each of described alms giver's macrocell has that be associated, fixing base station.
12. as the method for claim 11, wherein to be connected to described in be associated, the first wireless backhaul link that the mobile relay node of first in fixing base station is relevant, and to be connected to described in be associated, the second wireless backhaul link that the mobile relay node of second in fixing base station is relevant, be isolated from each other by assigning the frequency partition of separating to described first wireless backhaul link and described second wireless backhaul link.
13., as the method for claim 12, comprise the following steps: further
To each mobile relay node in alms giver's macrocell assign unique channel state information CSI reference signal RS with that be associated described in allowing, fixing base station the multiple mobile relay nodes in this alms giver's macrocell each between distinguish.
14. as the method for claim 13, and wherein said appointment is coordinated between described that be associated, fixing base station.
15., as the method for claim 11, comprise further:
Assign temporary protection frequency band the transmission in wireless backhaul link and the transmission on radio access links to be separated.
16. as the method for claim 11, and the quantity being wherein assigned to the Resource Block of wireless backhaul link and radio access links is unequal.
17. as the method for claim 11, and wherein frequency partition border is based on the dynamic assignment to the expectation relative scale business divided.
18. as the method for claim 17, and wherein this expectation relative scale business is for the business load that provides in frequency partition is divided by the active volume of relevant link.
19. methods as claimed in claim 1, wherein applying portion frequency reuse and application are that any one or both of the step of the wave beam forming of target are triggered in response to the generation of one or more predetermined condition with power-controlled.
20. methods as claimed in claim 1, wherein said mobile relay node is established to the wireless backhaul link of the geographically immediate stationary nodes of heterogeneous network.
21. 1 kinds of nodes, can for alleviating the interference relevant to the transmission on radio access links and wireless backhaul link in a radio communications system, and described node comprises:
Processor and transceiver, it is configured to applying portion frequency reuse between the radio access links relevant to mobile relay node and wireless backhaul link; And
It is the wave beam forming of target that wherein said processor and transceiver are configured to apply to the wireless backhaul link relevant to described mobile relay node with power-controlled further.
22. as the node of claim 21, and wherein said fractional frequency reuse is used in be had in alms giver's macrocell that be associated, fixing base station, and described base station is described node.
23. as the node of claim 22, and wherein said is that the wave beam forming of target is used in the described wireless backhaul link between that described mobile relay node is associated with this, fixing base station with power-controlled.
24. as the node of claim 23, and wherein said processor and transceiver are configured to applying portion frequency reuse through the following steps further:
First group of special frequency resource block is assigned to the described wireless backhaul link between described mobile relay node and described base station; And
Described radio access links to described mobile relay node assigns second group of special frequency resource block.
25. as the node of claim 24, and wherein said first group of special frequency resource block and described second group of private resource block can be assigned across whole available band.
26. as the node of claim 24, and wherein said processor is configured to, along with mobile relay node changes geographical position relative to described that be associated, fixing base station, regulate the power relevant to wireless backhaul link further.
27. as the node of claim 26, wherein said adjustment based on following at least one carry out:
A () measures at the Reference Signal Received Power RSRP of described mobile relay node place channel condition information CSI reference signal RS;
B () measures at the Reference Signal Received Quality RSRQ of described mobile relay node place channel condition information CSI reference signal RS;
C () maximum signal is measured than SLNR with noise leakage;
(d) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink link shared channels PUSCH;
(e) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink control channel PUCCH; And
(f) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to detection reference signal SRS.
28. 1 kinds of mobile wireless via nodes, it comprises:
Be configured to the housing be arranged on moveable platform;
Be configured to (a) in wireless backhaul link, transmit and receive at least one transceiver transmitting and receiving the wireless signal to and from least one subscriber equipment to and from the wireless signal of alms giver's macro base station and (b) on radio access links; And
Wherein this at least one transceiver is configured to the transmitting and receiving applying portion frequency reuse to the wireless signal be associated with this wireless backhaul link further; And wherein this at least one transceiver is configured to apply with power-controlled in the up link of this wireless backhaul link further is further the wave beam forming of target.

Claims (29)

1. store in memory and the method performed on a processor, for alleviating the interference relevant to the transmission in the radio access links of mobile relay node and wireless backhaul link, described method comprises:
(702) fractional frequency reuse is applied between the radio access links relevant to described mobile relay node and wireless backhaul link; And
The wave beam forming that (704) are target with power-controlled is applied to the wireless backhaul link relevant to described mobile relay node.
2. method as claimed in claim 1, wherein said fractional frequency reuse is used in be had in alms giver's macrocell that be associated, fixing base station.
3. method as claimed in claim 2, wherein said is that the wave beam forming of target is used in the described wireless backhaul link between that described mobile relay node is associated with this, fixing base station with power-controlled.
4. method as claimed in claim 3, wherein the step of applying portion frequency reuse comprises further:
First group of special frequency resource block is assigned to the described wireless backhaul link between described mobile relay node and described base station; And
Described radio access links to described mobile relay node assigns second group of special frequency resource block.
5. method as claimed in claim 4, wherein said first group of special frequency resource block and described second group of special frequency resource block can be assigned across whole available band.
6. method as claimed in claim 1, wherein said wireless backhaul link and described radio access links comprise up link and both downlink.
7. method as claimed in claim 3, comprises further:
Along with mobile relay node changes the geographical position relative to described that be associated, fixing base station, regulate the power relevant to wireless backhaul link.
8. method as claimed in claim 7, wherein said adjustment based on following at least one carry out:
A () measures at the Reference Signal Received Power (RSRP) of described mobile relay node place channel condition information (CSI) reference signal (RS);
B () measures at the Reference Signal Received Quality (RSRQ) of described mobile relay node place channel condition information (CSI) reference signal (RS);
C () maximum signal and leakage and noise ratio (SLNR) are measured;
(d) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink link shared channels (PUSCH);
(e) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink control channel (PUCCH);
(f) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to detection reference signal (SRS).
9. method as claimed in claim 3, comprises further:
To each mobile relay node assign unique channel state information (CSI) reference signal (RS) with that be associated described in allowing, fixing base station the relevant multiple mobile relay nodes of this alms giver's macrocell each between distinguish.
10. method as claimed in claim 9, wherein said application is that the step of the wave beam forming of target comprises further with power-controlled:
For each of the described wireless backhaul link between that be associated at described mobile relay node and this, fixing base station distributes different frequency partition.
11. methods as claimed in claim 1, wherein said fractional frequency reuse carries out between alms giver's macrocell, and each of described alms giver's macrocell has that be associated, fixing base station.
12. as the method for claim 11, wherein to be connected to described in be associated, the first wireless backhaul link that the mobile relay node of first in fixing base station is relevant, and to be connected to described in be associated, the second wireless backhaul link that the mobile relay node of second in fixing base station is relevant, be isolated from each other by assigning the frequency partition of separating to described first wireless backhaul link and described second wireless backhaul link.
13., as the method for claim 12, comprise the following steps: further
To each mobile relay node in alms giver's macrocell assign unique channel state information (CSI) reference signal (RS) with that be associated described in allowing, fixing base station the multiple mobile relay nodes in this alms giver's macrocell each between distinguish.
14. as the method for claim 13, and wherein said appointment is coordinated between described that be associated, fixing base station.
15., as the method for claim 11, comprise further:
Assign temporary protection frequency band the transmission in wireless backhaul link and the transmission on radio access links to be separated.
16. as the method for claim 11, and the quantity being wherein assigned to the Resource Block of wireless backhaul link and radio access links is unequal.
17. as the method for claim 11, and wherein frequency partition border is based on the dynamic assignment to the expectation relative scale business divided.
18. as the method for claim 17, and wherein this expectation relative scale business is for the business load that provides in frequency partition is divided by the active volume of relevant link.
19. methods as claimed in claim 1, wherein applying portion frequency reuse and application are that any one or both of the step of the wave beam forming of target are triggered in response to the generation of one or more predetermined condition with power-controlled.
20. methods as claimed in claim 1, wherein said mobile relay node is established to the wireless backhaul link of the geographically immediate stationary nodes of heterogeneous network.
21. 1 kinds of nodes, can for alleviating the interference relevant to the transmission on radio access links and wireless backhaul link in a radio communications system, and described node comprises:
Processor (820) and transceiver (810), it is configured to applying portion frequency reuse between the radio access links relevant to mobile relay node and wireless backhaul link; And
It is the wave beam forming of target that wherein said processor (820) and transceiver (810) are configured to apply to the wireless backhaul link relevant to described mobile relay node with power-controlled further.
22. as the node of claim 21, and wherein said fractional frequency reuse is used in be had in alms giver's macrocell that be associated, fixing base station, and described base station is described node.
23. as the node of claim 22, and wherein said is that the wave beam forming of target is used in the described wireless backhaul link between that described mobile relay node is associated with this, fixing base station with power-controlled.
24. as the node of claim 23, and wherein said processor and transceiver are configured to applying portion frequency reuse through the following steps further:
First group of special frequency resource block is assigned to the described wireless backhaul link between described mobile relay node and described base station; And
Described radio access links to described mobile relay node assigns second group of special frequency resource block.
25. as the node of claim 24, and wherein said first group of special frequency resource block and described second group of private resource block can be assigned across whole available band.
26. as the node of claim 24, and wherein said processor is configured to, along with mobile relay node changes geographical position relative to described that be associated, fixing base station, regulate the power relevant to wireless backhaul link further.
27. as the node of claim 26, wherein said adjustment based on following at least one carry out:
A () measures at the Reference Signal Received Power (RSRP) of described mobile relay node place channel condition information (CSI) reference signal (RS);
B () measures at the Reference Signal Received Quality (RSRQ) of described mobile relay node place channel condition information (CSI) reference signal (RS);
C () maximum signal is measured with noise leakage ratio (SLNR);
(d) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink link shared channels (PUSCH);
(e) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to physical uplink control channel (PUCCH);
(f) when described mobile relay node is launched in the data that described that be associated, fixing base station is relevant to detection reference signal (SRS).
28. 1 kinds of mobile wireless via nodes, it comprises:
Be configured to the housing be arranged on moveable platform;
Be configured to (a) in wireless backhaul link, transmit and receive at least one transceiver transmitting and receiving the wireless signal to and from least one subscriber equipment to and from the wireless signal of alms giver's macro base station and (b) on radio access links; And
Wherein this at least one transceiver (810) is configured to the transmitting and receiving applying portion frequency reuse to the wireless signal be associated with this wireless backhaul link further.
29. as the mobile wireless via node of claim 28, and wherein this at least one transceiver is configured to apply in the up link of this wireless backhaul link with power-controlled is further the wave beam forming of target.
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